DE19908834A1 - Catalytic converter arrangement with catalyst carrier bodies and device and method for their production - Google Patents

Abstract

The invention relates to a catalytic converter unit for exhaust-gas systems of motor vehicles, comprising a housing (1) for at least two catalyst substrates (2, 3) which are positioned one behind the other and each present axial channels (4) having first mean cross-sectional areas. The first catalyst substrate (2) has at least two or more through holes (5) which are parallel to the axial channels (4) and have second cross-sectional areas which are significantly larger than the first mean cross-sectional areas. The invention also relates to a device and a method for producing a catalyst substrate, notably a first such catalyst substrate (2), from at least one stack consisting of a plurality of at least partly structured sheet layers. Said device comprises a fork-like rolling device which engages each stack, can be rotated about a central axis and is substantially enclosed by a mould.

Description

The invention relates to a catalyst arrangement for exhaust systems from Motor vehicles with at least two catalyst carrier bodies and one Device and a method for producing a particular in this Catalyst support body to be used.

For the catalytic conversion of components of an exhaust gas Internal combustion engine is known on a catalyst carrier body to apply at least one catalytically active substance. Catalyst- Carrier bodies are made, for example, from layers of structured sheet metal, wherein the sheets are stacked and / or intertwined and so one metallic honeycomb body with axial gas channels through which an exhaust gas can flow form. The catalyst carrier body is arranged in a housing, which is part of an exhaust system.

Particularly in the case of so-called starting catalysts, these are catalysts which installed close to the engine and therefore very quickly after starting the engine Operating temperature, it is known to spiral catalyst carrier body to use alternating layers of smooth and corrugated sheets. Around The pressure loss of these catalyst carrier bodies is kept low partly intended to keep the central area free of windings, so that part of the exhaust gases can flow through there unhindered. That is why acceptable because starting catalysts are generally used in conjunction with others  pollution-reducing measures, such as further downstream catalytic converter Carrier bodies are operated.

In connection with catalytic converters there is due to the close proximity to the engine Installation and the resulting space problems the difficulty Space-saving catalytic converter arrangements and favorable in terms of flow technology to arrange. It should also be borne in mind that the catalyst carrier body in such catalyst arrangements by direct inflow of exhaust gas on their Front, especially in the longer due to the installation close to the engine Operation occurring high temperatures of the exhaust gas flow, are damaged can, which can lead to a decreasing conversion rate.

From the unpublished German patent application 197 55 703.1 is one Catalyst carrier body arrangement known for installation close to the engine, by arranging a collar on the catalyst carrier body surrounding housing an installation between a cylinder head and a Elbow of an internal combustion engine is possible. The arrangement with a further catalyst carrier body arranged directly behind for the Providing exhaust gas cleaning of the exhaust gases during continuous operation is in the With regard to the selected installation position not provided and also not possible.

DE-GM 86 31 017.8 describes a catalyst carrier body, in particular for use in a catalytic converter arrangement as a starting catalytic converter known, which has a non-winding central area and to the Production of alternating layers of smooth and corrugated sheets spirally wound where the innermost layer that surrounds the non-winding central area consists of a corrugated sheet for manufacturing reasons. Although is a such a catalyst carrier body in principle as a starting catalyst for arrangement suitable together with another catalyst carrier body, but results the problem of a through the central opening when installed close to the engine  possible damage to a downstream catalyst carrier body due to the direct and central inflow of the downstream catalyst Carrier body through the non-winding central area. Through the The central arrangement of the non-winding area is precisely the part of the exhaust gases directly on the front of a possibly subsequent catalyst Carrier body passed, which due to the flow profile in the arrangement has the greatest speed and also the highest temperature. This can, as mentioned above, for particularly rapid damage to one downstream catalyst carrier body in continuous operation, d. H. at high Exhaust gas flow temperature.

Devices and methods are known which are used to produce a Catalyst carrier body made of convoluted sheet metal layers are suitable. The Document WO 97/00725 describes such a device for Manufacture of a catalyst carrier body from at least one stack from one Plurality of at least partially structured sheet metal layers, which a multitude of channels permeable to a fluid, the device one by one central axis rotatable fork-like acting on each stack Has wrapping means and comprises a shape which the Wrapping device surrounds and the inner contour of the outer contour of the corresponds to the catalyst carrier body to be produced. The Wrapping device on at least two mandrels, which with or the stack (s) can be brought into engagement. By turning the Entangling device opposite the form, the stacks become one Honeycomb body engulfed, which fills the shape. The design, at least one non-winding area, as it is due to the above described fluidic conditions when installing such a manufactured catalyst carrier body in a catalyst arrangement as Starting catalyst would be necessary, is with the device taught in WO 97/00725, or not provided with the method taught there.  

It is an object of the invention to provide a catalytic converter arrangement for exhaust systems To create motor vehicles that require a small footprint, as well with installation close to the engine, a fluidically favorable operation with as much as possible long life of the catalyst carrier body used, wherein Another object is to provide an apparatus and a method create by which or by which corresponding in the Catalyst carrier bodies used can be produced, especially simple and inexpensive.

The object is achieved with a catalyst arrangement for Exhaust systems according to claim 1 and a device and a method for the production of a catalyst carrier body according to claim 11 or Claim 18 solved.

Advantageous further developments are in the respective dependent claims Are defined.

The catalyst arrangement according to the invention for exhaust systems from Motor vehicles have a housing and at least two catalytic converter Carrier bodies which are arranged essentially in succession and each have axially extending channels. The catalyst carrier bodies are in arranged the housing. According to the invention, the first catalyst Carrier body axial channels with a first average cross-sectional area and at least two or more parallel to the axial channels Through openings, which in relation to the first cross-sectional areas have significantly larger second cross-sectional areas. The catalyst Carrier body itself are preferably made of metal and are with a coated catalytically active material. However, it is also possible to do it directly to produce catalytically active material. The shape of the case and the inside  recorded catalyst carrier is largely the Space can be adjusted at the installation site.

The inventive design of the catalyst arrangement with at least two catalyst support bodies, which are essentially sequential arranged above all offers the advantage of the smaller space requirement of one such an arrangement, at the same time creating good flow conditions become. Furthermore, at least the ones provided according to the invention enable two or more passage openings of the first catalyst carrier body Catalyst arrangement that part of the exhaust gases flow through there unhindered can. In particular when the first catalyst carrier body is configured as Starting catalyst is an advantage. Also, there is no need for windings free, relatively large central area in the as a starting catalyst trained first catalyst carrier body remain free. this leads to according to the invention to uniform flow conditions in the range directly against the front of the second catalyst carrier body and this reduces the harmful effects of direct exhaust gas flow on the second catalyst carrier body. This measure only makes it possible the second catalyst carrier body essentially space-saving successively to the first, in particular as a starting catalyst Arrange catalyst carrier body because of the change mentioned Flow conditions due to the at least two passage openings in the first catalyst carrier body an inflow of the second catalyst Carrier body with hot exhaust gases in continuous operation less negative influence has the directly flowed front of the second catalyst carrier body, as this with a direct flow through a large central passage opening Case is.

From a fluidic point of view, it is particularly advantageous if the second Cross-sectional areas of the passage openings of the first catalyst carrier body  are each 5 to 20 times, preferably 10 to 15 times larger than the first cross-sectional areas of the axially through the or the catalyst Carrier body extending channels. This way is a particularly good one Flow through the passage openings, especially in continuous operation guaranteed.

An embodiment of the invention is particularly preferred Catalyst arrangement in which the passage openings of the first catalyst Carrier body each by the geometric center of their Cross-sectional areas have axial longitudinal axes that are not included through the geometric center of the first catalyst carrier body longitudinal axis coincide.

This particularly preferred eccentric arrangement of the passage openings leads this means that the speed at which the exhaust gases pass through the passage openings pass through is less than with a single central passage opening as is the case with the prior art. The reason for this is that parabolic speed profile, which is found in tubes with laminar Flow results depending on the radius. The underlying model is in first approximation also for flow in a substantially tubular Catalyst arrangement valid. The invention by the arrangement of the Through openings reduced flow rate directly through the Passages flowing hot exhaust gases in continuous operation reduces the Risk of damage to the downstream of the first catalyst carrier body second catalyst carrier body.

According to the invention, it is thus possible to at least the first catalyst To install the carrier body close to the engine, in particular it is preferred to use the first Catalyst carrier body in the end region of the manifold To arrange internal combustion engine. The first catalyst carrier can  thus, especially in the cold start phase of the motor vehicle, its task as Meet the starting catalyst particularly well.

The spatial dimensions of the catalyst arrangement according to the invention To keep them as small as possible, the catalyst support bodies are immediate arranged in succession, the distance depending on the spatial Conditions and is preferably in a range of 0.5 cm to 10 cm. A distance of 2 cm to 5 cm is particularly preferred.

As a housing for the at least two catalyst carrier bodies The catalyst arrangement according to the invention is preferably one in several Provided housing sections divided housing, the housing sections are connected to each other via tubular intermediate pieces and each Catalyst carrier body is received in a respective housing section. The connection of the housing sections to one another or their connection The tubular spacers can be used in a variety of ways take place, such as by screwing, but also detachably via the Connection by flange-like sections at the respective sections and Intermediate pieces that can be screwed, clamped or the like. Also the Arrangement of the housing as a whole in the exhaust system of motor vehicles can done in the ways described. The cross sections of each Housing sections, as well as the connecting tubular intermediate pieces can be adapted to the respective spatial conditions, preferably point however, all housing sections and / or spacers are uniform Cross section on. However, the second catalyst carrier body can also be one have a larger cross-section than the first.

In a particularly preferred embodiment of the invention The catalyst arrangement is the housing with only one housing section  formed, which receives the catalyst carrier body. The housing can can be made particularly compact in this way.

To improve stability, as well as to ensure good flow conditions possible mechanical loads, such as those in the Installation of the catalyst carrier body can occur to ensure exhibit the passage openings of the first catalyst carrier body preferably one Edge on which is thickened and in particular from a plurality of each other lying sheet metal layers.

At least the first catalyst support, one essentially, is particularly preferred formed from S-shaped or from involute-convoluted sheet metal layers Honeycomb body with axially running channels.

A device for producing a catalyst according to the invention Support body, in particular a first catalyst support body Catalyst arrangement according to claim 1, produces such a catalyst Carrier body from at least one stack, which consists of a plurality of at least partially structured sheet metal layers, which are a variety of for one Form fluid-permeable channels. The device has one by one central axis rotatable fork-like attacking each stack Wrapping device, which essentially surround a shape is, the inner contour of the shape of the outer contour of the to be produced Corresponds to the catalyst carrier body and being active according to the invention Winding mandrels are arranged on a carrier of the looping device, which can be brought into engagement with the stack (s) and for expansion the intertwined stack, in particular to form passage openings in the catalyst carrier body are movable.  

It is special due to the movable winding mandrels of the looping device simple and therefore inexpensive, catalyst carrier body, in particular first catalyst carrier body, the catalyst arrangement according to claim 1, which is preferably essentially S-shaped or involute-shaped intertwined sheet layers are formed, manufacture and with the above to provide described openings.

In a preferred embodiment of the device, the active ones Winding mandrels successively each have a first area in the axial direction with the smallest possible cross section and a second area with larger ones Cross section and a conical transition area, the axial Extension of the first and the second area at least the axial area Extent of the catalyst carrier body to be produced corresponds and where the cross section of the second region is essentially the desired one Cross section of the respective passage opening corresponds.

Furthermore, in this preferred embodiment, the device for Production of a catalyst carrier body the active mandrels in axial Direction relative to the stacks, from which a Catalyst carrier body is formed, movable. This movement can uniform for all active mandrels or for each individual active one Winding mandrel done individually. The wrap movement relative to the shape affects all active mandrels.

Since the active mandrels are preferably designed so that by a simple movement in the axial direction the stack can be engaged and the tangled stacks are expandable in the axial direction is a relative one simple mechanical construction of the active mandrels possible, which a particularly inexpensive manufacture of a device according to the invention and thus ultimately also a catalyst carrier body is possible. In addition  comes that the expansion in the conical transition area between the first Area and the second area of the respective active mandrel, whereby the respective passage opening in the Catalyst support body results, especially since the desired cross section of the respective Passage opening essentially through the cross section of the second region of the active mandrel is specified.

The just mentioned first preferred particularly preferably Embodiment of the device for producing a catalyst Carrier body on a base plate against the stack to be devoured supports the axial force applied by the active mandrels, whereby Openings are provided in the area of the respective active mandrels which the active mandrels expand as the convoluted stacks widen step through.

In a further preferred embodiment of the device for production of a catalyst carrier body, the active mandrels are perpendicular to them respective longitudinal axis while maintaining their axial orientation relative to the Movable stacking. It is particularly preferred if the active Winding mandrels are movable with an amplitude that the desired Diameter of the cross section corresponds to the respective passage opening. Also in In this second preferred embodiment, the active mandrels are used both to engage with the stacks to be devoured, or to devouring stack, as well as the expansion to form the respective Through openings in the catalyst formed by intertwining Carrier body.

The movement of the active mandrels according to the second preferred Embodiment of the device for producing a catalyst Carrier body can essentially by a circular movement of a  each of the active mandrels take place, the radius of the circular movement up to to the amplitude which increases the desired diameter of the Cross section of the respective passage opening corresponds.

Preferably, the active mandrels of the second preferred Embodiment of the device can be made individually movable, but it is also possible to make the active mandrels movable together by about the entire belt device is designed to be movable accordingly becomes.

The second preferred embodiment of the device for producing a The catalyst carrier body has the advantage of a low overall height.

It is particularly preferred if both preferred embodiments of the Device for producing a catalyst carrier body designed in this way be that the shape and the belt means rotatable relative to each other are. Furthermore, the shape can be formed in several parts, and by appropriate Mechanisms can be folded.

For the production of a catalyst carrier body, in particular a first one Catalyst carrier body of the catalyst arrangement according to claim 1, from a A large number of at least partially structured sheet metal layers becomes a method proposed, in which at least one stack of a plurality of at least partially structured sheet metal layers is layered. Each stack is in the essentially into one of the outer forms of the catalyst to be produced Carrier body introduced appropriate shape. Each stack is made up of one held in the central region of the mold wrapping device. All Stacks are against the by rotating the belt Form devoured into a catalyst carrier body, the whole form fills out. According to the invention, active mandrels  Wrapping device moves so that the intertwined stack through the Movement can be expanded, which in particular through openings in the Catalyst support body are introduced. The movement of the active Winding mandrels have already been explained above.

The procedure described is complicated Movements are waived. The procedure is simple and without further Difficulties feasible.

It is advantageous if each stack is folded by one fold line, whereby preferably an active winding mandrel is present in the area of each fold line is.

In a further preferred embodiment, the stack or stacks placed in an open mold with at least two mold segments and the mold is by pivoting the mold segments against the direction of rotation Wrapping device closed when a predetermined Degree of wrap is reached. It is not imperative that the stack be complete is entwined. The mold can then be closed be initiated when the extension of the not yet wrapped Section of the stack is less than or equal to the length in the circumferential direction of the Shape segment. If the closing process is then initiated, each supports Segment the wrapping process because the closing segments are still Press sections that are not wrapped around the axis.

Further advantages and features of the catalyst arrangement according to the invention and -Device, and the inventive method are based on the Drawing described.

Show it:  

FIG. 1 is a side sectional view of a preferred embodiment, the catalyst assembly of the invention;

Fig. 2 is a plan view of a first catalyst carrier body of a preferred embodiment, the catalyst assembly of the invention;

Fig. 3 is a side sectional view of a first preferred embodiment of the device according to the invention for producing a catalyst carrier body; and

Fig. 4 shows a second preferred embodiment of a device according to the invention for producing a catalyst carrier body.

Fig. 1 is a sectional side view of a preferred embodiment, the catalyst assembly of the invention. Two catalyst carrier bodies 2 , 3 are arranged in a common housing 1 . Both the first catalyst carrier body 2 and the second catalyst carrier body 3 have axially extending channels 4 and form a honeycomb body, the catalyst carrier bodies 2 , 3 being coated with catalytically active material (not shown). The first catalyst carrier body 2 is designed as a starting catalyst to be installed near the engine. It has two passage openings 5 running parallel to the axial channels 4 . These each have an approximately 16 times larger cross-sectional area than that of the axial channels. The passage openings 5 of the first catalyst carrier body 2 each have an edge 9 which is thickened and consists of a plurality of sheet metal layers of the same structure lying one against the other. The passage openings 5 each have axial longitudinal axes 6 running through the geometric center of their cross-sectional areas, which do not coincide with the longitudinal axis 7 running through the geometric center of the first catalyst carrier body.

This longitudinal axis 7 is also the longitudinal axis running through the geometric center of the second catalyst carrier body 3 . To adapt to the pipe diameter of the rest of the exhaust system, the end sections of the housing 1 have smaller diameters than the housing 1 itself.

The arrangement of the catalyst carrier bodies 2 , 3 is such that their respective diameters essentially correspond to the inside diameter of the tubular housing 1 and are thus fixed in the housing. The distance between the first catalyst carrier body 2 and the second catalyst carrier body 3 is a few cm. Due to the eccentric arrangement of the passage openings 5 in the first catalyst carrier body, the speed of the exhaust gases passing through the respective passage openings S is reduced in comparison to exhaust gases which would pass through a central opening. This also reduces the risk of damage in the area of the front face of the second catalyst carrier body which is directly exposed to the flow. The honeycomb bodies described are preferably made from at least partially structured sheet metal layers, which are connected to one another and to the housing by soldering.

FIG. 2 shows a cross section through the first catalyst carrier body 2 of the preferred embodiment of the catalyst arrangement from FIG. 1.

The first catalyst carrier body 2 is arranged in the housing 1 . The housing 1 is essentially tubular. The catalyst carrier body 2 has a multiplicity of sheet-metal layers which are essentially S-shaped and which form a honeycomb body with axially extending channels 4 . The passage openings 5 of the first catalyst carrier body 2 each have an edge 9 which is thickened and in particular consists of a plurality of sheet metal layers 8 lying one against the other. The axial longitudinal axes 6 running through the geometric center of the respective cross-sectional areas of the passage openings do not coincide with the longitudinal axis 7 running through the geometric center of the first catalyst carrier body 2 . Other configurations of the catalyst carrier body 2 are possible; in particular, the catalyst carrier body 2 can also be formed from sheet metal layers which are entangled in an involute manner, and a plurality of passage openings 5 can be provided.

Fig. 3 shows a first preferred embodiment of the invention an apparatus for Hersel averaging a catalyst carrier body according to.

The device comprises a mold 11 with a circumferential outer flange, which via connecting means, not shown, such. B. screws, is releasably connected to a base plate 16 . Openings 17 are formed in the base plate 16 , through which the winding mandrels 12 of the looping device 10 pass. The respective cross sections of the openings 17 correspond approximately to the cross section of the respective second regions 14 of the active winding mandrels 12 . The height of the mold 11 corresponds essentially to the axial extent of the first catalyst carrier body 2 , which in the device by rotating the wrapping device 10 relative to the mold 11 about the axis of symmetry of the device (not shown) from stacks introduced into the mold 11 , or from such a stack. It does not matter whether the mold 11 or the wrapping device 10 is actively moved.

The active winding mandrels 12 can be moved individually or together parallel to the axis of rotation of the device. The direction of movement corresponds to the axial direction of the first catalyst carrier body 2 . In particular, the axial movement downward and the expansion of the first catalyst carrier body by the conical transition regions 15 of the respective active mandrels takes place after the catalyst carrier body has been devoured, the first regions 13 of the respective active mandrels 12 with the stacks to be devoured, or the stack to be devoured. If necessary, a stop can be provided on the mold 11 in the upper region, which prevents the catalyst carrier body from being pulled along after the active mandrel 12 has been widened due to the tilted active mandrel 12 when the active mandrel 12 is pulled back (upward).

FIG. 4 shows a second preferred embodiment of the device according to the invention for producing a catalyst carrier body according to the invention.

The device of the second preferred embodiment corresponds essentially to the device of FIG. 3. In this case, however, no openings in the base plate 16 are necessary, since the active mandrels 12 apply essentially no axial forces to the catalyst carrier body. In the case of the device of FIG. 4, the entangled catalyst carrier bodies are widened by moving the active mandrels 12 perpendicular to their respective longitudinal axes. Two planes of movement are indicated by the arrows in FIG. 4. It goes without saying that the movement naturally takes place in all azimuthal angular directions. In particular, the movement can take place by a circular movement with an increasing radius, which is carried out by the respective active winding mandrels 12 about their longitudinal axis. The maximum amplitude corresponds to the desired diameter of the cross section of the passage opening 5 to be produced in the catalyst carrier body. Such an amplitude is indicated for both active winding mandrels 12 by the dashed lines in FIG. 4.

It applies to both the device according to FIG. 3 and the device according to FIG. 4 that the cross section of the active mandrels 12 is essentially circular, but in principle other cross sections, in particular drop-shaped cross sections, are also possible.

Reference list

1

casing

2nd

,

3rd

Catalyst carrier body

4th

channels

5

Outlet openings

6

Longitudinal axes of the passage openings

7

Longitudinal axis of the catalyst carrier body

8th

Sheet layers

9

edge

10th

Wrapping device

11

shape

12th

active mandrels

13

first area

14

second area

15

Transition area

16

Base plate

17th

openings

Claims (20)

1. Catalyst arrangement for exhaust systems of motor vehicles with a housing ( 1 ) and at least two catalyst carrier bodies ( 2 , 3 ), which are arranged essentially in succession and each have axially extending channels ( 4 ), the first catalyst carrier body ( 2 ) has at least two or more passage openings ( 5 ) running parallel to the axial channels ( 4 ) with essentially predetermined first average cross-sectional areas, which have significantly larger second cross-sectional areas in relation to the first cross-sectional areas. 2. Catalyst arrangement according to claim 1, characterized in that the second cross-sectional areas in each case 5 to 20 times, preferably around that are 10 to 15 times larger than the first cross-sectional areas. 3. A catalyst arrangement according to claim 1 or 2, characterized in that the passage openings ( 5 ) each have axial longitudinal axes ( 6 ) extending through the geometric center of their cross-sectional areas, which do not run through the geometric center of the first catalyst carrier body ( 2 ) Longitudinal axis ( 7 ) collapse. 4. Catalyst arrangement according to one of claims 1 to 3, characterized in that the first catalyst support body ( 2 ) is installed close to the engine. 5. A catalyst arrangement according to claim 4, characterized in that the first catalyst carrier body ( 2 ) is arranged in the end region of the manifold of an internal combustion engine. 6. Catalyst arrangement according to one of claims 1 to 5, characterized in that the catalyst carrier bodies ( 2 , 3 ) are arranged in direct succession, in particular at a distance of 0.5 cm to 10 cm, preferably at a distance of 2 cm to 5 cm. 7. Catalyst arrangement according to one of claims 1 to 6, characterized in that the housing ( 1 ) is divided into a plurality of housing sections which are connected to one another via tubular intermediate pieces, each of the catalyst carrier bodies ( 2 , 3 ) being accommodated in a respective housing section is. 8. Catalyst arrangement according to one of claims 1 to 6, characterized in that the housing ( 1 ) is formed with only one housing section which receives the catalyst carrier body ( 2 , 3 ). 9. A catalyst arrangement according to one of claims 1 to 8, characterized in that at least the first catalyst carrier body ( 2 ) is a honeycomb body with axially extending channels ( 4 ) formed essentially from S-shaped or from involute-convoluted sheet metal layers ( 8 ). 10. A catalyst arrangement according to claim 9, characterized in that the passage openings ( 5 ) of the first catalyst carrier body ( 2 ) each have an edge ( 9 ) which is thickened and in particular consists of a plurality of sheet metal layers ( 8 ) lying against one another. 11. Device for producing a catalyst carrier body, in particular a first catalyst carrier body ( 2 ) of the catalyst arrangement according to claim 1, from at least one stack of a plurality of at least partially structured sheet metal layers ( 8 ) which have a plurality of channels permeable to a fluid ( 4 ), the device having a fork-like wrap-around device ( 10 ) which can be rotated about a central axis and which engages each stack and which is essentially surrounded by a shape ( 11 ), the inner contour of the shape ( 11 ) of the outer contour of the material to be produced Corresponds to the catalyst carrier body ( 2 ) and wherein active winding mandrels ( 12 ) are arranged on a carrier of the wrapping device ( 10 ), which can be brought into engagement with the stack (s) and for widening the intertwined stack, in particular for forming passage openings ( 5 ) in which the catalyst carrier body ( 2 ) can be moved. 12. The apparatus according to claim 11, characterized in that the active mandrels ( 12 ) successively in the axial direction in each case a first region ( 13 ) with the smallest possible cross section and a second region ( 14 ) with a larger cross section, and a conical transition region ( 15 ) have, the axial extent of the first ( 13 ) and the second ( 14 ) region in each case corresponding at least to the axial extent of the catalyst carrier body ( 2 ) and wherein the cross section of the second region ( 14 ) essentially corresponds to the desired cross section of the respective passage opening ( 5 ) corresponds. 13. The apparatus according to claim 12, characterized in that the active mandrels ( 12 ) are movable in the axial direction relative to the stacks. 14. Device according to one of claims 11 to 13, characterized in that the device has a base plate ( 16 ) which supports the stack against the axial force applied by the active mandrels ( 12 ) and which openings ( 17 ) in the area of the respective has active mandrels ( 12 ) through which the active mandrels ( 12 ) pass. 15. The apparatus according to claim 11, characterized in that the active mandrels ( 12 ) are movable perpendicular to their respective longitudinal axis while maintaining their axial orientation relative to the stacks. 16. The apparatus according to claim 15, characterized in that the active mandrels ( 12 ) are movable with an amplitude which corresponds to the desired diameter of the cross section of the respective passage opening ( 5 ). 17. The device according to one of claims 11 to 16, characterized in that the shape ( 11 ) and the belt means ( 10 ) are rotatable relative to each other. 18. A method for producing a catalyst carrier body, in particular a first catalyst carrier body ( 2 ) of the catalyst arrangement according to claim 1, from a plurality of at least partially structured sheet metal layers ( 8 ), in which

• at least one stack of a plurality of at least partially structured sheet metal layers ( 8 ) is layered,
• each stack is introduced essentially into a shape ( 11 ) corresponding to the outer shape of the catalyst carrier body ( 2 ) to be produced,
• - wherein each stack is held by a wrapping device ( 10 ) arranged in the central region of the mold ( 11 ),
• - All the stacks are entwined by relative rotation of the wrapping device ( 10 ) against the mold ( 11 ) to form a catalyst carrier body ( 2 ) which fills the entire mold ( 11 ), and
• - Active mandrels ( 12 ) of the wrapping device ( 10 ) are moved so that the intertwined stacks are widened by this movement, whereby in particular passage openings ( 5 ) are introduced into the catalyst carrier body ( 2 ).

19. The method according to claim 18, characterized in that each stack is folded by one fold line, preferably an active winding mandrel ( 12 ) is present in the region of each fold line. 20. The method according to claim 18 or 19, characterized in that the stack or stacks is / are introduced into an open mold ( 11 ) with at least two mold segments and the mold ( 11 ) by pivoting the mold segments against the direction of rotation of the belt means ( 10 ) is closed when a predetermined degree of wrap is reached.